Portable sign



FIG. 1 is a top plan view of a portable sign showing my new design;

FIG. 2 is a front elevational view with the opposite side being a mirror image thereof;

FIG. 3 is a side elevational view with the opposite side being a mirror image thereof; and

FIG. 4 is a perspective view thereof. 

The ornamental design for a portable sign, as shown. 